Log in to the 3CX Web Client.
In the 3CX Web Client, click on the "Admin" settings.
Click on the "Call handling" button.
Click on the "+ Add digital receptionist" button to create an IVR/Digital Receptionist to create a new IVR/Digital Receptionist, if you are modifying and existing digital receptionist you can search for it and click on it to start editing.
Select the "Options" tab
Select the user or group that you want incoming SMS messages routed. After you selected the desired user or group, click "Save".
Now incoming SMS messages that would route to this IVR will forward to your selected user or group.